State what the state symbol (aq) means.
Deduce the mass of calcium carbonate two minutes after the reaction starts.
Explain how the graph indicates that the calcium carbonate is in excess.
The experiment is repeated at a higher temperature, with every other condition unchanged. Draw a line on Fig. 6.1 to show how the mass of calcium carbonate changes at the higher temperature as time increases.
Describe the effect, if any, on the rate of reaction when large pieces of calcium carbonate replace small pieces of calcium carbonate.
As the concentration of dilute hydrochloric acid rises, the rate of reaction of dilute hydrochloric acid with calcium carbonate rises too. Choose the correct unit of concentration: $\text{dm}^3/\text{g}$, $\text{g}/\text{dm}^3$, $\text{mol}/\text{dm}$, $\text{mol}/\text{dm}^3$.
Explain these results by reference to kinetic particle theory.
Hydrogen chloride decomposes to form hydrogen and chlorine at $1500^\circ\text{C}$. The reaction is endothermic. State what the term endothermic means.